Year	1=low to 6=high
2005	3.608108108108108
2006	3.675675675675676
2007	3.6486486486486487
2008	3.6486486486486487
2009	3.6710526315789473
2010	3.6578947368421053
2011	3.6447368421052633
2012	3.6025641025641026
2013	3.6538461538461537
2014	3.6710526315789473
2015	3.6578947368421053
2016	3.6447368421052633
2017	3.6153846153846154
2018	3.6842105263157894
2019	3.628205128205128
2020	3.6666666666666665
2021	3.6923076923076925
2022	3.7051282051282053
2023	3.730769230769231